SqlDataSourceView.DeleteCommand 屬性
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
取得或設定 SQL 字串，SqlDataSourceView 會用來刪除基礎資料庫的資料。
public:
property System::String ^ DeleteCommand { System::String ^ get(); void set(System::String ^ value); };public string DeleteCommand { get; set; }member this.DeleteCommand : string with get, setPublic Property DeleteCommand As String屬性值
SQL 字串，SqlDataSourceView 會用來刪除資料。
範例
下列程式代碼範例示範如何設定 DeleteCommand 文字，以從 Northwind 資料庫 Orders 數據表中刪除訂單。 數據是從 Orders 數據表擷取，並顯示在控件中 GridView 。 當 屬性設定為 true 時，會自動AutoGenerateDeleteButtonGridView轉譯 Delete 按鈕，並在按兩下 [刪除] 按鈕時自動填DeleteParameters入集合並呼叫 Delete 方法。 最後，由於此範例會刪除數據，因此會新增事件處理程式，以在執行刪除作業之前，嘗試將資料庫備份至磁碟。
<%@Page Language="C#" %>
<%@Import Namespace="System.Data.SqlClient" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
private void OnRecordDeleting(Object source, SqlDataSourceCommandEventArgs e) {
// Cancel the delete operation if the checkbox is not checked.
if (!CheckBox1.Checked) {
e.Cancel = true;
Label1.Text = "The command was cancelled because the CheckBox was not checked.";
}
}
private void OnRecordDeleted(object source, SqlDataSourceStatusEventArgs e) {
Label1.Text = e.AffectedRows + " row(s) were deleted";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ASP.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
<asp:SqlDataSource
id="SqlDataSource1"
runat="server"
DataSourceMode="DataSet"
ConnectionString="<%$ ConnectionStrings:MyNorthwind%>"
SelectCommand="SELECT * FROM Orders"
DeleteCommand="DELETE FROM [Order Details] WHERE OrderID=@OrderID;DELETE FROM Orders WHERE OrderID=@OrderID;"
OnDeleting="OnRecordDeleting"
OnDeleted="OnRecordDeleted">
</asp:SqlDataSource>
<br />
<asp:CheckBox
id="CheckBox1"
runat="server"
autopostback="true"
text="Check To Delete Data" />
<br />
<br />
<asp:GridView
id="GridView1"
runat="server"
AutoGenerateColumns="False"
DataKeyNames="OrderID"
AutoGenerateDeleteButton="True"
AllowPaging="True"
PageSize="20"
DataSourceID="SqlDataSource1">
<Columns>
<asp:BoundField HeaderText="Order ID" DataField="OrderID" />
<asp:BoundField HeaderText="Customer" DataField="CustomerID" />
<asp:BoundField HeaderText="Order Placed" DataField="OrderDate" />
<asp:BoundField HeaderText="Order Shipped" DataField="ShippedDate" />
</Columns>
</asp:GridView>
<asp:Label
id="Label1"
runat="server">
</asp:Label>
</form>
</body>
</html>
<%@Page Language="VB" %>
<%@Import Namespace="System.Data.SqlClient" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub On_Record_Deleting(ByVal source As Object, ByVal e As SqlDataSourceCommandEventArgs)
' Cancel the delete operation if the checkbox is not checked.
If Not CheckBox1.Checked
e.Cancel = True
Label1.Text = "The command was cancelled because the CheckBox was not checked."
End If
End Sub 'On_Record_Deleting
Sub On_Record_Deleted(ByVal source As Object, ByVal e As SqlDataSourceStatusEventArgs)
Label1.Text = e.AffectedRows & " row(s) were deleted"
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>ASP.NET Example</title>
</head>
<body>
<form id="form1" runat="server">
<asp:SqlDataSource
id="SqlDataSource1"
runat="server"
DataSourceMode="DataSet"
ConnectionString="<%$ ConnectionStrings:MyNorthwind%>"
SelectCommand="SELECT * FROM Orders"
DeleteCommand="DELETE FROM [Order Details] WHERE OrderID=@OrderID;DELETE FROM Orders WHERE OrderID=@OrderID;"
OnDeleting="On_Record_Deleting"
OnDeleted="On_Record_Deleted">
</asp:SqlDataSource>
<br />
<asp:CheckBox
id="CheckBox1"
runat="server"
autopostback="true"
text="Check To Delete Data" />
<br />
<br />
<asp:GridView
id="GridView1"
runat="server"
AutoGenerateColumns="False"
DataKeyNames="OrderID"
AutoGenerateDeleteButton="True"
AllowPaging="True"
PageSize="20"
DataSourceID="SqlDataSource1">
<Columns>
<asp:BoundField HeaderText="Order ID" DataField="OrderID" />
<asp:BoundField HeaderText="Customer" DataField="CustomerID" />
<asp:BoundField HeaderText="Order Placed" DataField="OrderDate" />
<asp:BoundField HeaderText="Order Shipped" DataField="ShippedDate" />
</Columns>
</asp:GridView>
<asp:Label
id="Label1"
runat="server">
</asp:Label>
</form>
</body>
</html>
備註
由於不同的資料庫產品使用不同的 SQL，SQL 字串的語法須視目前所使用的 ADO.NET 提供者 (可由 ProviderName 屬性識別) 而定。
如果 SQL 字串是參數型查詢或命令，參數的替代符號亦須視目前所使用的 ADO.NET 提供者而定。 例如，如果提供者是 System.Data.SqlClient，這是類別的預設提供者 SqlDataSource ，則參數的佔位元為 '@parameterName'。 不過，如果提供者設定 System.Data.Odbc 為 或 System.Data.OleDb，則 參數的佔位元為 '?'。 如需參數化 SQL 查詢和命令的詳細資訊，請參閱 搭配 SqlDataSource 控制項使用參數。
如果基礎資料庫支援預存程式，可以是 DeleteCommand SQL 字串或預存程式的名稱。
屬性的值 DeleteCommand 會儲存在檢視狀態中。
